Malicious PDF — malware analysis report

Static analysis result for SHA-256 502fe3b68baf2608…

MALICIOUS

PDF

91.6 KB Created: 2021-08-11 12:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2250e738a4e4ea31ecb85fd659e586c5 SHA-1: c03d1f7bd4c2b20b2316415ac89af89d2de072eb SHA-256: 502fe3b68baf2608b71bfef282d51f38785f203db09daf64a0b3666494377c31
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic firings strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/87bfe5bc07694e0d90550a3ba42f4338/94280880486.pdf In PDF document text
    • http://byty-pardubice.eu/UserFiles/File/39465745968.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9834bd3e9---vufabowidisexefosusav.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/14414858053.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/sefatexafutuw.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7766e293d---zakowowizofigamegapodu.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c5309ad6de294a03357bdd14d842514d/kojilovakexikejijilen.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e239b0156---82984976556.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/fubomak.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/sanivimomedivema.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210623034807.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/rabidunofofowenitanosuna.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/japakofipokad.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/pdlvn788e8slpid6jhqtan36ii/55104912254.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a105074d486---69367694864.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7366a0cec1379b2f6dfea752006650c7/tejetubitiwod.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/82735d042cbb339ddf45975a000be476/wemisuzudivirar.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/49697459972.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gc8eln6q8ludcgjt48o97sjqc0/67599223613.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a823cf5f---86092612830.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082daff069d1---fifulaxajino.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/faba9ca36a2842df2b69f8a38690b8c9/85292393461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=philips+actiwatch+spectrum+proPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 10720 bytes
SHA-256: 18ba65d7d54ffb6a1641c230d4cf3dac3b39a48b6ee8a53d39cd7a51b1276840
font_01_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB6 18640 bytes
SHA-256: ff53f9be8c26605f8e066d4e9221dd38b392c53ddf95aac5b9049cab3fceb6b4

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